[rfc, rfa/doc] Multi-threaded watchpoint improvements

[Luis Machado]

Hi,

> Luis reported some problems, too (last October).  The discussion
> trailed off waiting for him to look at it further.  I also tested on a
> PowerPC system before committing the patch, so it's got to be some
> combination of factors that didn't show up on my target.

Sorry i'm late on this. The problem i originally reported to Daniel back
then was actually a typo that happened in his patch, thus the hardware
watchpoint wasn't triggering at all. This happened because the address
wasn't being set. It was a quick fix.

Thanks for the improvement Andreas.

Best regards,
Luis